I once had a long distance GF. We would take a pair of her panties, she would wear them as we had online or phone sex, and push them in to get as much of her juices as possible, then seal them in a baggie and mail them to me. I'd put a few loads in them (sucking on the crotch until I was ready to cum). She would repeat with them and send again. Sometimes I would keep a small jar in the fridge of my jo's, and pour that onto the crotch. It for some reason would think on its own.
We met periodically and had a lot of fun, an would reenact some of the fantasies we shared long distance. She would have fucked another guy if I asked, but I never did. Her next local BF got her involved in 3 ways FFM.